Abrasive wheel



Dec. 7, 1937. R R, RABER 2,101,193

ABRASIVE WHEEL Filed Nov. 30, 1934 2 Sheets-Sheet l INVENTO.R R. R. f? A B E R ATTORNEY R. R. RABER ABRASIVE WHEEL Dec. 7, 1937.

Filed Nov. 30, 1934 2 Sheets-Sheet 2 A 1 n u! INVENTOR R.R.RAB E R v BY 4 A'TTORNEY' Patented Dec. 7, 1937 UNITED STATES PATENT OFFICE ABRASIVE WHEEL New Jersey Application November 30,1934, Serial No. 755,293

4 Claims.

This invention relates to abrasive wheel mountings and particularly to a wheel head for surface grinding machines adapted to have detachably mounted therein a plurality of abrasive blocks or segments arcuate in form and arranged in a circle concentric to the axis of rotation of the head.

This application describes and claims an improvement upon the Abrasive wheel disclosed in Hoagland Patent No, 1,797,526 granted March 24,

An object of the present invention is to provide a strong, rigid head adapted to mount a plurality of separated arcuate or segmental abrasive blocks within a single circle, the construction forming substantially a homogeneous unitary structure built up of steel members autogenously Welded to each other for operation at high rotative speeds.

Another object of the invention is to provide a wheel head having, a solid ring of rolled or forged steel sufficiently heavy to withstand the stresses of severe operation of the wheel head at high rotative speeds.

Another object of the invention'is to provide improved means for positioning the abrasive blocks forwardly after they have become worn, abutment members for this purpose being rotatable into and out of positions to engage the inner or upper end surface of the abrasive blocks.

With the above and other objects in view, my invention consists in the features of construction and operation set forth in the following specification and illustrated in the accompanying drawings.

In the accompanying drawings annexed hereto and forming a part of this specification, I have shown my invention embodied in a wheel head for relatively large diameters and adapted for application to .a vertical surface grinding machine, but it will be understood that the invention can be otherwise embodied and that the drawings are not to be construed as defining or limiting the scope of the invention, the claims appended to this specification being relied upon for that pur- In the drawings:

Figure 1 is a vertical sectional view taken centrally through the axis of rotation of the wheel head on the broken line l-l of Fig. 2.

Fig. 2 is a partial plan view of the wheel head looking at the under side of the head as seen in Fig. 1.

Fig, 3 is an isometric view of the under side of the wheel head showing several abrasive segments in operative position and. also indicating the position of an abutment member adjusted for a worn abrasive segment.

Fig. 4 is a vertical sectional view taken through a space between adjacent abrasive blocks showing the abutment member in position for short blocks.

Fig. 5 is an isometric view looking toward the rim of a portion of the Wheel head showing the abutment member in position for short blocks similar to that shown in Fig. 4, and

Fig -6 is a sectional view taken diametrically through a portion of the wheel head prior to machining operations thereon showing the assembly of members composing the wheel headand the means for rigidly securing them together.

In the above mentioned drawings I have shown but one embodiment of the invention which is now deemed preferable, but it is to be understood that changes and modifications may bemade within the scope of the appended claims withoutdeparting from the spirit of the invention.

' Briefly, and in its broadest aspect, my invention may include the following principal parts: First, an annular or cylindrical ring; second, atop plate suitably formed on or secured to the ring memiiher; third, abrasive segmental blocks clamped in spaced positions to the inner surface of the ring -memberyfourth, reinforcing ribs formed within the supporting ring and engaging one end of each abrasi've block or segment; fifth, rotatable abut- 1 ment members cut away on one side and rotatable into and out of positions bearing against the inner or upper end surface of the abrasive blocks; and sixth, strap clamps engaging contiguous portions of adjacent abrasive blocks and bolted or otherwise secured to the annular supporting ring.

Referring more in detail to the figures of the drawings and first referring to Figs. 1, 2 and 3,

it will be seen that the head or wheel mounting includes a ring member IUthe inner cylindrical surface of which forms a rigid bearing surface for the abrasive segmental blocks II. The top plate 12 forming part of the head and formed integrally with or rigidly secured to the ring it is providedwith means whereby the head or mount' :ing may be attached to the spindle I3 of a grinding machine. These means may include a plurality of screws I4 but one of which is shown passing through a flange 15 formed on the spindle l3 and entering threaded holes within a recessed portion of the top plate I2 carefully surfaced and adapted. to contact with the flange IS on the spindle [3.

In order to form abutments for the abrasive blocks when initially placed in the head and when suitably spaced apart in the top plate l2 so that there will be two of these studs l6 engaging each of the abrasive segments H preferably adjacent the opposite end surfaces thereof. 7

In order to secure the abrasive blocks or segments i l in fixed position within the head, clamping straps ii are provided securely clamping the abrasive segments against the inner surface of the ring I!) by being connected directly thereto by.

elongated screws I8 shown in Figs. 2 and 3. Each strap ll bears against the closely spaced ends of adjacent blocks H and may preferably have angularly adjustable bearing mem bers' IQ-inserted therein to accommodate themselves to the blocks. Spaced along the inner surface of the ring member l8 are inwardly extending reinforcing ribs 20 against which an end surface of each abrasive segment may engage and through which may extend the screws for clamping the abrasive blocks in position. These ribs 20 therefore form lateral abutments for the blocks H.

Inorderto form rigid stops or abutments for the abrasive segments after they have become worn and have been set out in order to expose another portion thereof, circular abutment members 22 are provided-within the ring member and secured rotatably tothe top plate member l2 as by means of-screws 23 shown in Figs. land 2. It will be seen from an inspection of Fig. 2: that these rotatable abutment members 22 may be adjusted about their supporting screws 23 to operative or inoperative position. Each of these abut- -ment members22also is cut away along one side closely parallel to a diameter. In the position shownin Fig. 2 the rotatable abutment members -22 are out of contact with the abrasive blocks II and are simply retained in' inner or inoperative position against the top plate l2. When the abrasive blocks or segments l I have been unclamped and moved outwardly after havingbeen worn the abutment members 22 are rotated substantially which bring the periphery of these members directly under adjacentportions of contiguous blocks! i this adjusted position the members form. supporting surfaces for the-blocks H materiallyspaced outwardly from the bearing surface providedbythe studs 16 in the-top plate member H2. The clamping straps'l'l may be used Without anychangein their position with the ;abrasive blocks H andthe rotatable abutment members 22 in either position. In their operative position the members 22 engage adjacent ends of adjacent blocks H so that each-block is sup ported bytwo of the members 22. As shown in Figs. 2 and 5, the members 22 may be centrally recessed'to provide a-relatively narrow bearing surface about its periphery onone side.

Referring now to Fig. 6, it willibeseen that-the entire body portion of the head is made up of 7 steel members of simple form which may be obtained in rolled or forged shapes. .These pieces are shown in section in Fig. 6 prior to any ,ma-

chiming operations-thereon but after they have been welded in position. It will be seen that the ring member I 0 and the top plate member l2 are they are of full length, studs 16 may be inserted --member H are Web members 25 reinforcing the structure and also the abutment members 20 welded to the lower portion of the Webs and to the lower edge of the ring member at spaced points about the periphery of the head. With the members autogenously welded into position, which may readily be done by arc or oxy-acetylene weld- .ing and suitably annealing the members thereafter, the head is machined to the desired dimensions and form indicated in Figs. 1 and 2.

What I1 claim-is:

.11. -An abrasive wheel head comprising in com- 'bination, a body member, reinforcing members therein, abrasive blocks within said body member positioned against said reinforcing members, clamping means for said blocks, and rotatable plate-like members pivotally supported upon fixed axes within-said body member adapted in one position to engage the inner ends: of adjacent blocks to support said blocks in advanced posi- :1"; .tions.

'2.,An abrasive wheelhead comprising in combination, a body member, reinforcing members therein, abrasive blocks within said body memberpositioned against said reinforcing members,

clamping means for saidblocks, and rotatable plate-like members pivotally supported upon fixed axes Within said body member movable to positions into and out of engagement with the inner ends of the abrasive blocks whereby said blocks maybe supported in two positions withinv said head.

3..An abrasive wheel head comprising in combination, a body member, abrasive blocks therein,

clamping means for said blocks engaging adja-.

c-ent ends-of contiguous blocks, and rotatable plate-like members pivotally supported upon fixed axes within said body member disposed adjacent the inner ends of'said blocks and rotatable to ,positions. into and out of engagement with the inner end surfacesof said blocks, each rotatable member in its block supporting position engaging adjacent ends of contiguous blocks.

4. An abrasive wheel head comprising in combination, a body member, abrasive blocks therein disposed within a circle, clamping means for sai'd'blocks, and rotatable plate-like members pivotally supported uponfixedaxes arranged Within a circle Within the body member, said rotatable members being disposed adjacent the inner ends of said blocks and rotatable to positions engaging the inner ends of said abrasive blocks whereby said blocks may be supported in advanced positionsby said'rotatable members.

ROBERT R. RABER. 

